I've browsed the internet in search of an answer, but I can't find anything specific enough. I had such a vivid dream about my ex boyfriend, whom I had dated for 8 years (he broke up with me). I dreamt that I was pregnant with his child and that we got back together. When we told my family, they accepted him back into our lives and accepted our situation. This is actually far from what reality would be, because he cheated on me and really hurt me.
I think that means your unconscious is missing him :)